Improvement and evaluation of deacidification process technology for off-shore platform associated gas
In order to realize the advanced treatment and comprehensive utilization of associated gas in off-shore oilfields,the improved process has been formed by adding inter-stage coolers,implementing rich liq-uid diverting and optimizing the formulation of alcohol amine solution on the basis of combing the conventional deacidification process.The influence trend of key parameters on the process is determined by single factor anal-ysis,and the adaptability of the improved process on the different production stages is analyzed.The results show that the mass fraction of MDEA and PZ should be controlled 30%～35%and 2%～3%separately.The change of inter-stage cooling temperature is inversely proportional to process energy consumption while the change of reboiler temperature is positively proportional to process energy consumption.After optimization,the unit energy consumption of decarbonization in the early stage of production can be reduced from 4.79 GJ/t to 4.34 GJ/t,with a decrease of 9.39%.The process can be applied to the working condition range of associat-ed gas volume of 10×104～17×104 Nm3/d and CO2 content of 14.32%～25.64%,and the gas phase of return tank can be directly used for subsequent CCUS flooding.The research results can provide theoretical basis and practi-cal reference for energy conservation transformation of associated gas deacidification system in offshore oilfield.
offshore platformassociated gasdeacidificationparameter optimizationdecarbonization unit consumption
NETL
NSTL
万方数据
